Updated Netware makefile
Makefile.netware (via an AWK script) used to pull the version numbers
from configure.ac. Since they are no longer there, 'configure.ac' puts
them into 'configure' for Makefile.netware to find. This change makes
it look there.
NOTE: This has not been tested on a Netware system.

Moved version number to src/version.h
Up to now, the version numbers were defined in configure.ac and put
into gd.h by generating it from gd.h.in, replacing the values of
several C macros. This violates the DRY principle, won't work on a
dumb build system, confuses some dev tools and gives the wrong version
when the DLL is updated without recompiling the client.
This change adds several functions to the API to return the version
inf…